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Growling Transfer Case

Hay guy's, I'm in need of some advice for my 2006 silverado. Late this spring I started to notice a growling semi grinding noise when ever I drive really slow like backing up to the trailer. I jacked the rearend up than put it in gear and crawled under and found out that it's coming from the transfer case. It only makes this noise when the drivetrain is hot. Not the motor but everything else. Had the truck at the dealers 3 times and they said they called up GM and they said that the new trucks have clutch less transfer cases so that sometimes you will hear this gear noise. I think its a bunch of crap because the truck didn't do this in the winter. They changed the fluid in the transfer case also thinking that the fluid was too thin but it didn't do anything. Also it makes this noise in 2wd, 4hi but not in 4lo for some reason. Any suggestions or if you have noticed this on your new silverado would be great.

Why go so slow, I plow 7 commercial lots with my 4.3, never had a problem yet. She's got plenty of power. Not as much as my buddys F250 diesel but I push right beside him in snow 8" deep. Don't worry about it.

Tripple L Quote: "I see your explination now, My 06 has twin electric fans on it and a MONSTER 18,000 lbs tranny cooler that I installed on it infront of the rad. the electrics are nice, As soon at the temp gets to 105 they kick in and boom! 1 -2 minutes later it's back down to 90. There great. Never had a cooling issue at all, even in the summer blasting around town with the A/C on pulling a 8,000 lbs. trailer and givin it, the guage never moves. If your dosent have electric fans and your having heating issues I would strongly recommend them.